Blog

Occasional writings on code, design, and life.

• July 12, 2026

  Decoupling Level: Measuring How Replaceable Your Modules Are

  The share of a system living in small, independently replaceable modules: the ICSE 2016 metric, approximated from the import graphs of eleven codebases.

• July 5, 2026

  Propagation Cost: The Number That Measured Mozilla's Rewrite

  One number for how far a change can ripple: the 2006 paper that measured Mozilla's redesign, and the same metric computed on eleven codebases today.

• June 28, 2026

  Fitness Functions: Telling If Your Architecture Still Works

  Where the idea comes from, the problem it solves, a mental model drawn out, examples across seven industries, and an interactive quiz.

• June 21, 2026

  The Modularity Maturity Index

  Its history, its three pillars drawn out, and a demo library broken then fixed to show what each one costs.

• March 12, 2026

  SaleSpotter: A Technical Retrospective

  Architecture, challenges, and lessons learned from building a large-scale retail data platform.